The Collaborative International Dictionary of English v.0.48:
Citraconic \Cit`ra*con"ic\, a. [Citric + aconitic.] Pertaining to, derived from, or having certain characteristics of, citric and aconitic acids. [1913 Webster] Citraconic acid (Chem.), a white, crystalline, deliquescent substance, C3H4(CO2H)2, obtained by distillation of citric acid. It is a compound of the ethylene series. [1913 Webster]